This book focuses on three of the main categories of myeloproliferative neoplasm: polycythemia vera, essential thrombocythemia, and primary myelofibrosis. Relevant laboratory and clinical advances are comprehensively covered, and great emphasis is placed on the practical issues that challenge physicians in their daily practice. The main topics considered thus include contemporary diagnostic approaches, the value and limitations of mutation screening for diagnostic and prognostic purposes, risk stratification in terms of both survival and other disease complications such as leukemic transformation and thrombosis, and modern therapeutic strategies, including conventional drugs, allogeneic stem cell transplantation, and experimental drugs still under study.